Motor brake



Y 1,560,896 A. DEWA N DRE MOTOR BRAKE Filed Aug. 2e. 1921i z shmpsnm 1 Tn venfar.-

" jjerf e Wqzni'r www Nw. 1o, 1925. 1,560,896

A. DEWANDRE MOTOR BRAKE Filed Aug. 2s, 1924 zsneetsneet 2 L Ven for? jlrfe Wan Zr@ Patented Nov. 10, 1925.

j UNIT-ED STATES ALBERT DEWANDRE, or LIEGE, BELGIUM.

MOTOR BRAKE.

Application filed August 26, 1924. Serial iNo. 784,299.

To all whom/ z't may cncern:

Be it known thatl I, Animar Dnwaxonn, a

l subject of the King of Belgium, residing at Liege, in the Kingdom of lelgium, have invented certain new and useful Improvements in Motor Brakes, of which the following is a specification.

This invention relates to an improven'ient in or modification of my prior inventions described in my Patent No. 1,539,166, granted May 26, 1925y and in my application No.

4699,022 filed March 13, 1924..

' The object of the present invention is to provide a particularly advantageous torni of construction of the prior arrangements.

According to the earlier constructions,

the brake lever or pedal is joined to .Y the brake gear by means of connecting pieces -which permit a displacement of the said lever relative to the gear, this relative displacement-controlling the distributor which puts `the brake cylinder into connuumca-y tion with the suction 'of tl1e-engine. In order to obtain for the operation ot the brake lever or pedal an action which increases With the braking action exerted by the motor brake, the construction disclosed in application No. 699,022, provides for the connection of the motor part of the -brake to a gear by means of a system of levers or cables which is also connected with the brake lever or pedal.

The main object offthe present invention is to obtain the objects of the two earlier constructions by a simple mechanism which also permits the control of the distributor to be effected by means of connecting rods.

The characteristic features of the construction according to the present invention will be seen from the description of the apparatus hereinafter given by Way of example -With referenceto the accompanying drawings whichl illustrate two forms of construction. Y In these.drawings:'- Figure l is a perspective View of a .brake mechanism embodying the invention. 1

Figure 2 is an enlarged detail section taken along the line llL-l-I-ll ot Figure 1.

Figure 3 is a part-sectional side elevation of Figure 2, as indicated by the line lll- Hl thereof.

Figure 4 is a sectional view of a detail. Figure 5 shows in perspective a second form of construction. Y 'llhe mechanism illustrated in the drawaihollow coupling connected by a neck 2, di!

rected towards the dashboard (not shown) of the chassis, with a distributor 4 of a suitable type xcd to the said dashboard, conn'ection between the distributor and the neck 2 being made by a flexible joint T his distributor is provided with control rods 7 and 7a acting as will be described later and allows the suction pipe of the engine tol be put into communication with the cylinder 8,01c the motor brake, which latter comprises the said cylinder and a piston (not shown) which Works therein; the distributor being connected to cylinder 8 by means of a pipe 9, as has. been described in the aforesaid vprior cases. The cylinder 8 is fixed to the longitudinal member of the chassis by means of brackets 10.cast on the y cylinder.

In the form of construction shown in Figures 1 to 4, the previously mentioned piston of the cylinder 8 is displaced under the influence of the suction of the' engine and pulls a cable 11 connected also to a lever H12 keyed on a shaft 13 turning in suitable supports mounted on the chassis.

At the other extremity of the shaft 13 is keyed in addition a second lever 14 which will accordingly move in the direction of the arrow X under the influence of the suction of the engine and will produce the displacement of the connectingr rod 15 of adjustable length. This connecting rod operates a transmission lever 16 one extremity.-

of which carries a movable pin 17 on which is also mounted a second lever 18 pivoting about the fixed shaft 19, and forming a part of the brake redding. Y

The connecting rods 2O and 21, which operate the rear and front brakes, respectively,

are directly attached to the said lever 1S on levers 16 and 18 are respectively connected at their lower ends by rods 24 and 25 to a leverl 23, keyed to the shaft of the brake pe a The head of the rod 25 isl provided with an oval opening 26, Fig. 3, the major axis of which is arranged along the direction of the rod, and in which can move a lateral pin or stud 28 on the lever 23 which also moves the rod 24.

It is seen by this arrangement that the displacement of the lever 16 upon operafv tion of the motor brake, will exert by means of the rod 24 a reaction on the pedal which will bc directly opposed to the ei'ort exerted by the driver and the intensity of which will increase with the action exerted on ythe brake drums.

This connection will also allow the direct working of the brakes by the pedal in case of failure of the motor brake to operate.

The combination of oval slot 26 and pin 28 forms a lost motion coupling between the pedal and the brake rodding.

In the position of rest, the pedal occupies normally the position shown, under the action of a returning spring 30, in such a manner that the pin 28 butts against the front face of the slot 26 or against a regulating screw 40.

When the pedal is operated, a relative displacement is produced between the lever 23 and the rod 25 due to the lost motion connection above referred to. It is `this displacement which is made use of to effect the operation of the distributor. To this end the rod 25 carries laterally andconcentrically with the oval slot 26 a cylindricalfshoulder 32 on which can turn an arm 33 which is additionally connected to the fixed stud 34 carried by the lever 23.

The connection between the stud 34 and the arm 33 is made by means of a square block or member 35 which can slide slightly in a. slot 36 made in the arm 33.

The other extremity of this arm 33 carries a pin 38 connected to the end of the adacent driving link 7 of the distributor.

t is to be mentioned that the pin 38 remains approximately arranged along the axis of pivotal movement of the brake pedal in such a manner that the displacement of the pedal does not affect the said pin 38.

As has been alread mentioned, this particular construction o the mechanism of the motor brake operates according to the same principles as those which are described in my earlier applications.

When a pul is exerted on the pedab 22, the pin 28 1s displaced in the oval slot 26, and the lever 33 is turned by the action of lthe stud 34,' around the shoulder 32 of the rod 25. The said arm or lever 38 is thus disin which the pin 38 of the lever is causedl to move toward its initial position to an extent suiiicient to 'ensure the disconnection of the cylinder 8 from the engine suction, but not suiiicient to open said cylinder to the atmosphere.

This last action occurs only when the 'pedal 22 makes its return movement.

This invention also provides for the placing of the distributor on the engine casting so as to dispense' with the neck 2. lVith this object in view the suction passage formed in the engine casting would have a supplementary outlet to which the distributor woulchbe directly attached.

The invention also provides for placing the distributor on the cylinder o the motor brake or on the bottom of the cylinder.

According to the second form of construction shown in Figure 5, the cable 11, attached to the piston of the motor cylinder (not shown), acts on a lever 40 which is pivoted to a lever 41 and which bears at its other extremity against a lever 42 which forms an extension of the brake lever or pedal 44 pivoted on the shaft 43.

The swinging lever 40 acts therefore like a reaction piecel in a reverse direction to the effort exerted by the operator on the pedal and proportionally to the brake acf tion exercised on the brake drums.

The brake cable l45 which actuates said drums is also connected to the lever 41.

The operation of the distributor, not shown onl the drawings, is effected as already described in Figures 1 to 4 bythe relative displacement which is roduced between the lever 46 connected to t e rod 48 which actuates the distributor and the second lever 47 the latter being connected to astud 52 car-V ried by the first lever 46 and pivoted on a fixed shaft 53.

The rod 49 carries a part provided lwith an oval slot 51 which lis traversed by a pin 50 rigid with the lever 47 in the same way that the slot 26 of the rod 25, is traversed by the pin 28 rigid with the lever 23. The lever 47 is connected to the lever 41 by a rod 54 in the same way that the lever 23 is connected to the transmission lever 16 by the rod 24.

. A push on the pedal 44 rocks the lever 42 and hence moves the rod, 49 thus causing a ylOO lll)

' slot 5l.

relative displacement between the oval slot 51 and the pin-50. The lever 46, the lowest part of which turns on. an annular shoulder sition corresponding to the disconnection ot the engine suctionn The pin is resigrednto'its initial position when the pedal makes its return movement which .is transmitted to the rod 49 and, hence, to the" part of said rod which is pro.n vided with the slot 51.

What ll claim is:

1,. In a brake system for motors, the combination, with a suction pipe, a distributor' therein, and redding for-the brakes, of a brake motor connected with the vredding to actuate the same and adapted to be placed in alternative communication with said pipe and `with the atmosphere by the distributor; a cont-rolling lever for operating said distributor; a pair of arms articulated together, one'armA being positively connected to sald lever andthe other, arm havingl a lost-motion connection therewith; connecting means between one arm: and the brakerodding; and al lcornnection*between thev distrilzmtorand` one arm' to operate the former consequent upon a variation in the relative' positions of the two arms.A

2., In a brake system for motors, the c0111-,

bination, with a suction pipe, a distributor therein, and rodding for the brakes, of a.

brake motor connected with the redding to actuate the same and adapted to be placed in alternative communication with said pipe and with the atmosphere by the distributor; a controlling lever for operating said distributor; a pair of arms articulated together, one armbeing positively connected .to said lever and the other arm having a `lost-motion connection therewith; connecting means between one arm and the brake rodding; 'a connection between the distributor and one arm to operate the former consequent upon a variation in the'relative positions of the two arms; anda supplemental connection between said arms operatively associated with the brake motor to "transmit the action ot the latter to said lever.

3. In a brake system for motors, the com- Vbination, with a suction pipe, a distributor therein, and redding tor the brakes, of a brake motor connected with the rodding to actuated the same and adapted to be placed in alternative communication with said pipe and withthe yatmosphere by the distributor; a controlling lever tor operating said distributor; a pair of arms articulated together, one arm being positively connected to said lever and the other arm having a lost-mo i tion connection therewith; connecting means between one arm and the brake redding; a connection between -thedistributor and one arm tooperate the former consequent upon a variation in the relative positions of the two arms; a member connected to one of said arms; a lever pivoted to said member; a connection between the second-named lever and the other arm; and separate connectin means between said second-named lever an the brake motor to transmit thegaction of the latter to the former.

. In testimony whereof l have i: ed my signature. u

ALBERT nnwnnnnn, 

